Transflective LCD Black Matrix Segmentation for Color Mixing
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Solution Overview
Problem
Transflective LCDs suffer from color mixing and low color gamut due to color resistance mixing and oblique electric fields, which adversely affect image quality and user experience.
Innovation Solution
A display panel design with a first substrate and a second substrate oppositely disposed, where the second substrate includes an array structure layer, a shielding layer, and a reflective layer, and the shielding layer has light shielding units that cover the space areas between reflective units, reducing the need for a strip-shaped black matrix and minimizing color mixing, while the polarizer layers are optimized for phase compensation using a Poincare sphere model to adjust RGB light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transflective LCD structure is used to achieve both transmissive and reflective display modes, then the display can utilize advantages of both transmissive and reflective LCDs, but color mixing occurs due to color resistance mixing and oblique electric fields, resulting in low color gamut and poor image quality
Solution Approach 1:
The black matrix is segmented into multiple independent black matrix portions (first black matrix portions and second black matrix portions) that are selectively positioned. The first black matrix portions cover spacers and the second black matrix portions cover light shielding units, allowing independent optimization of each segment's position and size to prevent color mixing while maintaining display versatility.
Solution Approach 2:
Different regions of the display panel are assigned different black matrix configurations. The first black matrix portions are specifically positioned to cover spacer locations where color mixing occurs in transmissive mode, while the second black matrix portions cover light shielding units. This local differentiation allows the structure to maintain both transmissive and reflective mode capabilities while preventing color mixing in specific critical areas.
2Manufacturing precision
If black matrix portions are added to cover spacers and light shielding units to reduce color mixing, then color gamut and image quality improve, but the device structure becomes more complex
Solution Approach 1:
Multiple black matrix portions (first and second black matrix portions) are merged into a single integrated black matrix layer that is formed in one manufacturing process step. This unified structure, while providing differentiated coverage for spacers and light shielding units, is manufactured as a single entity, avoiding the need for separate manufacturing processes and reducing overall structural complexity.
Solution Approach 2:
The black matrix layer serves multiple functions simultaneously: it provides electrical insulation, prevents color mixing in transmissive mode by covering spacers, and maintains reflective display performance by covering light shielding units. This multi-functionality reduces the need for additional separate components, thereby simplifying the overall device structure despite the enhanced functionality.
3Manufacturing precision
If a strip-shaped black matrix is used to prevent color mixing, then image quality improves, but reflectivity is reduced due to the oblique electric field effect
Solution Approach 1:
The black matrix is segmented into discrete portions positioned only at specific locations where color mixing occurs (spacer and light shielding unit positions) rather than forming continuous strip-shaped structures. This segmentation approach provides targeted color mixing prevention while minimizing the total black matrix area, thereby preserving reflectivity in the remaining display regions.
Solution Approach 2:
Black matrix portions are applied locally only where needed to prevent color mixing, rather than using continuous strip-shaped black matrices across the entire display. The first black matrix portions are positioned at spacer locations and the second black matrix portions at light shielding unit locations, providing localized color mixing prevention while maintaining high reflectivity in the overall display structure.
Data Source
AI summary
Provided are a display panel, a preparation method thereof, and a display apparatus. The display panel includes a first substrate and a second substrate disposed oppositely, and a liquid crystal layer sandwiched between the first substrate and the second substrate, wherein the first substrate includes a black matrix layer and a color filter layer which are sequentially disposed on a first base substrate; at least one of the first substrate and the second substrate further includes a spacer; and the black matrix layer includes at least one first black matrix, and an orthographic projection of each first black matrix on the first base substrate covers an orthographic projection of the spacer on the first base substrate.